The lookup method returns the value at the specified path in the JSON array.
NOTE: This method does not make a copy of the value, so modifying the returned value affects the original array.
lookup( pathElements )
| Argument | Description |
|---|---|
pathElements
|
(json_path_string_or_integer) The path of the value to return. Specify one or more path elements, which might be object attribute names (strings) or array indexes (integers). |
(LuaJsonValue) Returns the value that exists at the specified path, or nil if the specified path does not exist.
The following example demonstrates how to obtain a value:
local myJsonObject = LuaJsonObject:new( { product="IDOL" , version=11 } )
local myJsonArray = LuaJsonArray:new(0, 1, 2, myJsonObject)
local myValue = myJsonArray:lookup(3, "product")
print (myValue:value())
-- IDOL
The following example demonstrates how modifying a returned value affects the original array:
local myJsonObject = LuaJsonObject:new()
myJsonObject:assign("name", LuaJsonArray:new("value1"))
local myJsonArray = myJsonObject:lookup("name"):array()
myJsonArray:append("value2")
print (myJsonObject:string())
-- {"name":["value1","value2"]}